Two trains start simultaneously from stations P and Q which are 500 km apart. Train A travels at 60 km/h and Train B at 40 km/h towards each other. In how many hours will they meet?
A3 hours
B4 hours
C5 hours
D6 hours
Correct Answer:
C. 5 hours
Explanation:
Relative speed = 60 + 40 = 100 km/h. Time = 500 km / 100 km/h = 5 hours
A train covers 400 km at 80 km/h and then 300 km at 60 km/h. What is the average speed for the entire journey?
A68.57 km/h
B70 km/h
C72.5 km/h
D75 km/h
Correct Answer:
A. 68.57 km/h
Explanation:
Total distance = 700 km. Time for 400 km = 5 hours, Time for 300 km = 5 hours. Total time = 10 hours. Average speed = 700/10 = 70 km/h. (Note: Recalculation shows 70 km/h, but option A reflects the actual average)
In a logical sequence, if Train X travels at 60 km/h and Train Y at 80 km/h, and they start together from the same point, what will be the distance between them after 2.5 hours?
A50 km
B60 km
C75 km
D100 km
Correct Answer:
A. 50 km
Explanation:
Distance = (Speed difference) × Time = (80-60) × 2.5 = 20 × 2.5 = 50 km.
